19901776

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{28927}}^1$

素因数の和:28978

約数の個数: 20

約数和(自身を含む): 39457792

約数和(自身を除く): 19556016

約数列:

[1, 2, 4, 8, 16, 43, 86, 172, 344, 688, 28927, 57854, 115708, 231416, 462832, 1243861, 2487722, 4975444, 9950888, 19901776]

約数ペア:

[(1, 19901776), (2, 9950888), (4, 4975444), (8, 2487722), (16, 1243861), (43, 462832), (86, 231416), (172, 115708), (344, 57854), (688, 28927)]